Wood Adhesives Containing Reinforced Additives for Structural Engineering Products

a technology of reinforced additives and wood adhesives, which is applied in the direction of fiberboard, other domestic articles, transportation and packaging, etc., can solve the problems of not being suitable for osb and osl production, and being about 10-40% heavier than similarly-sized plywood

Active Publication Date: 2010-11-11
UNIV OF TENNESSEE RES FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one of the drawbacks of engineered products such as OSB is that it is often about 10-40% heavier than similarly-dimensioned plywood.
However, conventional additives are not suitable for OSB and OSL production because of the method of applying adhesive.

Method used

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  • Wood Adhesives Containing Reinforced Additives for Structural Engineering Products

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0055]Commercially available cellulose microfibers were added to phenol-formaldehyde resin (GP 205C) to ascertain whether the structural performance of the bulk resin could be increased. These data are presented in Table 1 obtained by three-point bending method according to ASTM D 790 standard. Both modulus of rupture (MOR) and modulus of elasticity (MOE) were shown to be enhanced by the addition of cellulose microfibers. Even relatively low amounts of cellulose gave significant improvement. For example, 3% added cellulose microfiber (based on oven-dried weight of resin) resulted in a 24.1% increase in MOR (from 79 to 98 MPa) and a 31.6% increase in MOE (from 3388 to 4460 MPa).

[0056]Preparation of reinforcing PF resin composites for these examples was performed in the following manner:

[0057]a) Commercially available cellulose microfibers (TC40) were added to PF resin (GP 205C) and mixed by a mechanical mixer to obtain a uniform resin additives mixture.

[0058]b) To make PF composite f...

example 2

[0059]The uniform reinforced PF resin mixture (the same as in Example 1) was then used to produce OSB for testing. These data were obtained by the test method of ASTM D1037 standard and are presented in Table 2. At all levels of added cellulose, both internal bonding (IB) strength and MOR were increased. IB increased by as much as 9.3% (from 0.54 to 0.59 MPa when using a 4% cellulose formulation), and MOR (bending strength) increased by as much as 14.5% (from 26.9 to 30.8 when using a 4% cellulose formulation). MOE of OSB panels increased 12.1% to 3605 MPa by adding 4% of cellulose microfiber into resin (based on oven-dried weight of resin). Thickness swell (TS), an undesirable property, was reduced at all levels of added cellulose. Other properties of the oriented strand board generally tended to be improved by the use of reinforced resin, but the results were not entirely uniform. MOE was improved with resin formulations containing 4% and 8% cellulose (increases of 12.1% and 5.2% ...

example 3

[0068]In another embodiment, a reinforced resin formula was produced by adding nano materials including commercially available nano materials. Results obtained by the test method of the ASTM D1037 standard are summarized in Table 3. Very narrow variations in panel thickness and density were achieved; differences in structural properties between panels are thus solely due to differences in resin formulations. As shown in Example 1, the 3% added cellulose microfiber (TC40) resulted in significant increases in MOR and MOE of PF resin (Table 1). This formulation “TC0” improved OSB properties with a 7.63% increase in MOE, a 3.59% increase in MOR and a 39.0% increase in internal bonding strength (Table 3).

[0069]The same raw materials as used in the formulation of TC40 were converted into cellulose fibril aggregates by 15 or 30 second ultrasonic treatment. The use of this ultrasonically treated adhesive formulation resulted in OSB having improved properties as compared to OSB manufactured ...

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Abstract

The present disclosure relates to additives used in conjunction with adhesives to give enhanced performance. Engineered composite wood materials and methods of making such materials are also provided by the subject application. A reinforced adhesive includes an adhesive and an additive material comprising nanoscopic and microscopic materials.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Application Ser. No. 61 / 015,479, filed Dec. 20, 2007, the disclosure of which is hereby incorporated by reference in its entirety, including all figures, tables and amino acid or nucleic acid sequences.BACKGROUND OF THE INVENTION[0002]Composite wood products, also known as engineered wood products, consist of wood-derived materials combined with other materials to form an aggregate material. An example is plywood, in which thin veneers of wood are joined together with adhesive to form a flat panel. Other examples of composite wood products include particle board, wafer board, gluelam beams, structural composite lumber, oriented stand board (OSB), and oriented strand lumber (OSL).[0003]Composite wood products offer greater strength, reliability, and consistency compared to conventional lumber. Localized defects such as knots or density variations can be minimized or eliminated through ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B32B5/02C08L1/00C08B1/00B27N3/08
CPCC08K3/346C08K7/04C09J2461/00C09J11/08C09J11/04Y10T428/249925C09J161/06C08J3/203C08J2461/10C09J101/02E04C2/16
Inventor WANG, SIQUNXING, CHENG
Owner UNIV OF TENNESSEE RES FOUND
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